The initial
three maps in this interactive
map application show the population living in
group quarters based on the 2000 census. Map 1
displays the institutionalized population
confined to correctional facilities. Map 2 shows
the population living in student dorms and
Map 3 shows the population residing in military
quarters.

Additional maps include
census data on income, housing, language, and education. Change maps by clicking the drop-down menu under
"Compare Maps" to the left of the map
window.

Maps 25 and 26 show state legislative
district boundaries themed by
correctional population by district. Use the
INFO tool to query for correctional population
percentages by district.

To
maximize the viewable area, toggle off the
history folder. Map links can be e-mailed or bookmarked for
future reference. Use the arrow buttons on your
browser to compare previously viewed maps. Click
the HELP icon for additional assistance.

The Group Quarters Mapper is
based on Census 2000 Summary File 1 data, which
makes it ideal for looking at how group quarters
populations impact census data. Unfortunately,
Census 2000 did not always place group quarters
in the correct location. Facilities are
sometimes in the wrong block, wrong tract, wrong
town or even occasionally in the wrong county.
Care should therefore be taken when using the mapper or the shapefiles for non-Census 2000
purposes.

Many of the misplaced institutions are
mentioned in news stories listed in the
bibliography (http://www.prisonersofthecensus.org/bibliography.shtml)
on
PrisonersoftheCensus.org. Many but not all
of the geocoding errors were reported to the
Census and corrected as part of the Count
QuestionResolution program (http://www.census.gov/prod/cen2000/notes/).
The Census provides corrected population and
group quarters counties for states, counties and
towns, and a spreadsheet for each state
(organized by fips code) that identifies the
corrected counts down to the block level. Users
that need positional accuracy are advised to
compare the block numbers in these Count
Question Resolution reports with the block
numbers of the
institutions they are attempting to locate.

Map 1 (Default map) -- Population in Correctional
Facilities

At a scale of about 5 miles,
the block group population counts for persons living
in correctional facilities are displayed in
purple boxes.

Select the ZOOM TO button and
click on the map to display population and group
quarters data at the block group level in a table
below the map image. Select the INFO tool and
then click on the map for additional information
across all layers of geography.

Maps 11 and 12 are color-coded at the block group
level only. Color coding is not applied to
the county or tract levels (75-200-mile scale),
since the absolute numbers depicted by the dots
are more meaningful . The dots are scattered
randomly by tract or county, and do not
represent specific population centers..

ZOOM IN or use the FIND button for block group
level analysis (i.e. a scale of about 0 to
50 miles)

At the
tract level, scaled blue dots represent persons
(50 and higher) with limited English-speaking ability;
and at the
county level scaled red dots represent
persons (100 and higher) with limited English speaking ability.
At a scale of about 10 miles, the actual
block-group level numbers
are displayed in purple boxes.

Color coding shows the percentage of Spanish
speakers who either "do not speak English well" or
"do not speak English at all". At a scale of about
10 miles, block group population counts for
these two limited English categories are
displayed in purple boxes.

Note:
Some official definitions (for instance, Voting
Rights Act Sec. 203 language minority coverage) extend the
term "limited
English" to include persons who "speak
English well". Under these
interpretations, just one category --
"Speak English Very Well" -- defines persons who are
considered proficient in English.

Note: Undercount rates are calculated after
removing the group quarters population. The
Census Bureau did not adjust for this population
because it was excluded from the Accuracy and
Coverage Evaluation.

Map 19 -- Households without a
vehicle

At a scale of about 5
miles, block group counts of households without a
vehicle are displayed in purple boxes.

Source: Census 2000 Summary File 3 (SF 3)
Sample
Data

Map 20 -- Population 25 and over
without a high school degree

At a scale of about 5
miles, the block group-level population 25
and over without a high school diploma is played in purple boxes.

Source: Census 2000 Summary File 3 (SF 3)
Sample
Data

Map 21 -- Foreign Born Non-citizen
Population (any race or ethnicity, all ages)

At a scale of about 5
miles, the block group count of foreign born
non-citizens is displayed in purple boxes.
Percentage calculations are based on the total population. (all ages) Note: A similar
block-group level map based on
single-race/ethnicity or voting age population
cannot be produced due to data suppression for
many block groups.

Source:
Census 2000 Summary File 3 (SF 3) Sample
Data

Map 22 -- Population Ages 15 to 24

At a scale of about 5
miles, the block group-level population
age 15 to 24 is displayed in purple boxes.